The extremes of the rental in US cities

Rent increases were strong for luxury apartments and those of the middle market. However the disparity between these two types of apartments can be great. Among large US cities, which ones have the greatest disparity? This also reflects the disparity in living standards of the inhabitants. Among those are: Evanston, Illinois, a town north of Chicago, Oakland, California, West New York, NJ, St. Louis, Missouri, Toledo, Ohio, Detroit, and other amazing cities.